Read for filth.
Not long after Sengo started dating, his family let him move into the pool house out back of his parents' house - it cut down on the noise concerns, and it cut down on the musty teen-boy smell wafting from his bedroom.
It also meant he didn't have to worry about a curfew, which is how he found himself where he was now, energetically fucking his girlfriend's best friend on top of a pile of laundry - because his girlfriend and another girl she'd brought over, whose name he hadn't gotten, were both sprawled on his bed in the wet spot, still recovering from their last round.
Sengo could be crass, and oblivious, and needy, but you had to give him one thing - he didn't stop until his partners were well-past satisfied. Personally, he considered that persistence his best personality trait.