There was this one colored hentai where this guy let this girl give him blowjobs because she liked his cum and eventually they had sex. No genitalia for either is explicitly shown I don’t think. There was this one part in it where they’re in his bedroom, he’s sitting on the bed, she’s on the floor sucking him off and she’s just leaking from her pussy and they had sex after that then they woke up in the morning.