You try

"Sam! Fuck! Get off me!" You forcefully shove Sam backwards, and he rolls onto his back, cock jutting up at you. You glower at him and point towards the living room. "Out!" Sam looks suitably chastened and picks himself up from the floor. "You know what's at stake! I can't take the risk!" "I'll pull out," he says, unconvincingly, as he steps forward again, angling his head to kiss you. You push him back again. "No! We can't! Not until we've dealt with Mandy!" Sam looks pissed, but doesn't make a move at you again. "Well, at least help me with this, then!"

He points down to where is cock is still standing proudly, unperturbed by your refusal. Fuck it, it's only fair. You drop to your knees and begin working him with both hands. With his precum and your spit, your hands glide over his flesh easily and eagerly. You stroke and squeeze, tickle and twist as best you can, pulling every trick out of your extensive collection to make this as good as possible for him. He's earned that much, at least. Sam leans over you, resting his head on the shower wall behind you and squeezing his eyes shut. Clearly, you're doing something right. You move one hand down to fondle his heavy balls, playing with them carefully. This would normally be the point where you take him into your mouth to finish him off, but of course that's not an option today. Instead, you keep up your attentions until you feel he's about to cum. "Cindy! Fuck!" Sam can't seem to say any more than that. He thrusts his hips forward into your hand, and you duck your head to one side just in time to evade the first, thick jet of cum, letting it splatter harmlessly against the glass wall. You return both your hands to his shaft and use them to milk every drop out of him. You are amazed at how much cum he his able to produce so shortly after donating another huge load not half an hour earlier. It's a shame you'll have to give him Mandy. Leaves less of him for you. Still plenty, though, if the cum-covered glass just behind you is any indication.

You stand back up and give Sam a quick kiss. "There, all better now." You slap his ass as you leave the shower, and quickly dry yourself off before walking out of the bathroom. Your hard work has made you thirsty, and you fill up a glass of water, drinking half of it by the time Sam stumbles out of the shower as well. "I think, " Sam says, still panting and dripping wet, "I think it's bed time." No sooner have the words left his mouth, or he's collapsed onto the bed. He crawls further onto it and scoots to one side, making room for you.