crotch of his shorts.
'Feeling horny?' she asked with a smile.
'Jealous is more like it. Yes, and horny. Very fucking horny.'
'Jealous because of Steve and me?'
'Why the hell else?'
'You were spying on us last night?'
Mark's eyes turned to gaze forlornly down at the floor. 'Yes.'
'Have a good time?'
Mark blushed and said nothing.
'Mark, Steve and I really dig each other,' Susan began slowly, as if talking to a very small child. 'It doesn't matter that we're cousins. What happened between you and me… it was… what can I say… spontaneous, yes, but it was my first time. You opened up a whole new world for me. But it's Steve I really like. Not that it wasn't good with you, it was, but with him it's…'
He looked up. 'Better, right?'
'Mark please, try to understand.' She walked over to him and knelt in front of him. He felt his cock growing hard in his jeans.
'What's there to understand?' He started to get up. Susan pushed down on his thigh, keeping him in his seat.
Suddenly she felt an onrush of affection for him. He looked so lonely, so vulnerable. She was surprised to feel a tingling in her cunt, the familiar warm feeling she now identified with making love with Steve.
She struggled with herself for a moment, but only for a moment, then she unbuttoned Mark's shorts and pulled down his zipper. She pulled out his raging hard on. She gasped.
'I forgot how big it is. Jesus, it really is enormous!'
He smiled. 'Make it with me, baby,' he whispered, cupping his palm under her chin. 'Please. I need you. I need the tight feel of your hot cunt. I know you're hot for me. I know you're hot for us both. Admit it…'
Maybe it's true, she thought. I know I can't live without Steve now, he's become such a close part of me. But maybe I do feel the same sort of thing for Mark too and I just don't want to admit it to myself.
She felt the excitement welling up inside her. She didn't resist when he leaned over to undo her bikini bra. She moaned when he held her tits in both hands.
'Steve is getting dressed,' she sighed. 'He'll be knocking in a minute…'
'Let him knock.'
'The door's not locked.'
'Then I'll lock it.'
'No, Mark, wait. Steve won't understand. Let me talk to him.'
'You're just making excuses.'
She looked at his prick, which, was inches from her mouth. Mark fell to his knees and took her in his arms.
'Mark, please…'
'It's just like the first time, baby. You really want it, but you'll fight me all the way.'
'That's not true… Mark, please.'
His hand slipped into her bikini bottoms and he kissed her, his tongue ramming into her mouth.
She took hold of his prick and started stroking it.
'Suck it,' he ordered her, pushing her head down until her lips surrounded his cockhead.
She went down on him, gagging as he forced her to take every tick inch of his hard-on.
Once she tasted his musky fuck-meat she knew she couldn't resist. The thought of Steve accidentally stumbling into her room while she sucked his older brother off left her mind completely. All she could think of now was Mark's impressive cock.
'That's nice,' he sighed. 'Really nice.' He writhed on the floor, twisting his body and sending his cock screwing between her hungry lips.
Then he started humping into her face, at the same time tearing off her bikini bottoms and sticking his middle finger between her pouting cuntlips.
She massaged his balls, feeling their cum-filled weight and realizing just how large his member was — much thicker and longer than Steve's lean cock. It had an exciting character all its own.
He came surprisingly quickly, gasping with delight and humping into her face for all he was worth, sending his prick head against the very back of her throat. His cum splashed against the roof of her mouth and she reveled in its hot smoothness as it traveled down her throat in great sticky gobs.
She sucked his cock until it was completely dry. Then she sucked it more. Finally he had to pull her head away.
'Baby,' he gasped. 'I told you you wanted it. You can't get enough of my big cock!'
She ran her tongue over cum-stained lips as he stood up and tugged on his shorts.
'You better get dressed, Susan, if Steve's going to be here any minute.'
'Jesus, yes. Mark, please, don't tell him I sucked you off. Promise me.'
'If you promise me you'll do it again. And fuck me too.'
'I promise.'
Mark grinned. 'It's a deal then.'
'Why don't you get into your trunks and join us.'
'You don't mind?'
She reached behind herself to tie her bikini bra, then gave the boy a kiss, putting her arms around him. 'Of course not. You know I like you. It's not that. It's just that… oh, I don't know. So much has happened in the past couple of days my head is still swimming!'
'Yeah, I know what you mean. I met this fantastic girl on the beach.'
There was a knock on Susan's door. 'You ready, Sue?' It was Steve.
'Tell me about her later,' she whispered to Mark. Then she called out, 'Come on in, Steve. I'm all ready.' The door opened and Steve walked in, surprised to see his brother standing there. 'Mark's going to join us,' Susan said. 'Okay?'
'Sure,' Steve said. 'Why not?'
Susan was relieved to see the brothers smiling at each other, friendly and at ease again. Though she didn't fail to notice the younger boy's puzzled look when he walked in and saw Mark standing awkwardly beside her.
After a swim that left the youngsters with blue lips and goose bumps despite the humid afternoon, they spread two large terrycloth towels on the sand and lay down to let the sun dry them off. Susan lay sandwiched between the two boys.
She soon sensed that something was happening between them. There was a sudden tension in the air, a sense of anticipation. She gazed over to Steve and saw his cock was visibly hard inside his swim briefs. Then she turned to look at Mark's crotch and saw that his prick was also rock-hard, its prick head peering out over the elastic band of his trunks.
She put her hand to her mouth and started to giggle uncontrollably. The boys opened their eyes and realized at the same time that their cocks were hard. They had both been daydreaming about fucking Susan and hadn't realized they were sporting hard-ons.
Steve blushed and turned over on his stomach. This made Susan laugh hysterically. Then Mark burst out laughing, not bothering to hide his tremendous hard cock. Mark had never seen his brother's prick erect before and his eyes widened when he saw just how thick and long it was.
'Jesus,' he said under his breath. Mark smiled proudly and spread his legs slightly.
Susan wiped the laughter team from her eyes and didn't know what to do next.
'Looks like we're both a little horny, eh Steve?' Mark said, grinning.
Steve smiled sheepishly. 'Looks like it, kiddo.'
Mark looked at Susan, then at his younger brother. 'I think maybe it's time to put our cards on the table, so to speak.'
Steve looked down and traced patterns on the sand with his forefinger. 'Yeah, I guess I've been thinking the same sort of thing.'
