This is a different variation of the same kind of theme as "Bet Your Sweet Ass." In this one, though, the siblings are in lockdown due to coronavirus, parents and her boyfriend are quarantined elsewhere, and the brother and sister are a little slower, more hesitant in pushing their luck. A little.
A Story in the 'Sperming' series (3) A follow-up to 'Sperming My Girl' and 'Sperming My Nieces'. Dan won't fuck closely-related females because that would be incest. 'Fucking' he defines as sliding his cock in and out of them until he cums. But jacking off and squirting into their open pussies is okay, in his mind. Of course, the women still get pregnant, and when Valerie, his sister-in-law comes to stay, she's quite happy for him to sperm her pussy too.
Another of Mervin's Mistaken Identities Tales
A young girl tries to get relief in the beach, and when an opportunity for fun in the showers comes up, she takes it. She also creates some mischief between brother and sister.