As much as you're worried about Alexis' reaction, your reactions seem beyond your control. More moans leak from your lips while you're distracted by the effort it takes to keep your legs straight.
Karen seems to have picked up her mother's technique fairly quickly, and the combination of pleasure on your penis and your prostate drive you towards the edge.
Karen leans in closer, her hand stroking your cock at nearly uncomfortable speeds while she forcefully grinds the cucumber into your prostate at an angle.
"Didn't you hear me? Cum. Now!"
On the last word, you lose the last scraps of control, body shuddering as small but high-pressure spurts of cum shoot out of your cock, spattering all over Karen's school uniform.
Your legs give way, causing you to drop more heavily on the cucumber Karen has stuffed up your backside.
The sudden force pressing against your prostate intensifies your orgasm even further, making you let out something between a moan and a whimper.
Your legs have no strength in them, and Karen has to hold you up by firmly pressing you against the wall with her voluptuous figure.
"How was that...?"
You're not sure she expects an answer, and you don't have the presence of mind to give one in any case...
While you're still trying to get your legs working properly again, Karen plants her mouth on your neck, digging her teeth into a small area of skin and sucking on it hard enough to hurt.
After a few moments, Karen pulls back, shooting a smug look at Alexis, then giving you an evil grin.
"Now no one will mistake him for a wild bunny."
The light throbbing on your neck makes you suspect you've gained a rather prominent hickey.
While your thoughts are a little muddled, you can't imagine the latest sequence of events going over very well with Alexis...
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