Calvin's basically that dude everyone knows who fucked up his entire life and now crashes at his buddy's place indefinitely. You know the type - probably smells like disappointment and cheap beer, except in this case he's about to become the neighborhood's most unlikely sex educator. His friend's family isn't exactly throwing welcome parties, but hey, free housing is free housing.
The daughter Megan's got this whole straight-A student thing going but she's completely clueless about anything below the waistline. Perfect setup for some seriously questionable mentorship, right? She's supposed to be this innocent bookworm type who's never even figured out what her own body parts do, which honestly feels a bit ridiculous but whatever - we're not here for realistic character development. The corruption angle is pretty obvious from the jump, and it plays out exactly like you'd expect with Calvin slowly introducing her to increasingly kinky shit. There's voyeurism elements scattered throughout where you're basically being a creepy old pervert watching this girl discover her sexuality, which... yeah, that's definitely a choice the developer made.
This whole thing is apparently inspired by some classic called Cohabitation, though I never played that one so can't compare. The sandbox mechanics let you wander around the house and interact with different family members at various times, building relationships and unlocking new scenarios. You've got your standard progression of handjobs leading to oral, then full penetration, anal, the whole escalation ladder. There's groping scenes, masturbation sequences, sex toys get introduced eventually. The 3DCG animation is serviceable but nothing groundbreaking - characters move like they're made of slightly melted plastic sometimes. Mobile compatibility is there if you want to be that guy jerking off to trainer games on your phone. Developer admits they made this to decompress from stress, which honestly explains the unpolished feel throughout.