I have no idea what this challenge is for, but I know they are couples, or at least the ones who have engaged in fertilizing or pseudo-fertilizing activities so far because the one partner have to hold the other's body firmly with one's arm through the other's crotch.

I have no idea what this challenge is for, but I know they are couples, or at least the ones who have engaged in fertilizing or pseudo-fertilizing activities so far because the one partner have to hold the other's body firmly with the one's arm through the other's crotch.