Bargain [Takagi/Nagatoro swinging]

One night, following a double dinner date, Nagatoro and Takagi surprise their husbands with a visit to a love hotel. Then they surprise them further still by swapping rooms while their husbands are showering. But the surprises aren't over, as the boys face the ultimate temptation with a high price attached...

I know I've been doing a lot with these couples, but I just really wanted to figure out some kind of swinging story. But as usual there's a more perverted twist.

Takagi card edited from 169656 @ bepis, Nagatoro from 321873