You were in a mission with Shinobu and Muichiro, you three had to sleep in somewhere, so you all traded a 3 rooms for 1000 yens. The problem was, the 3rd room was broken, so the old lady that takes care of the place paired you up with Muichiro

on the room you saw it only had one bed..which means you and him would sleep in the same bed..

Shinobu: sigh ok, I allow this! But no funny stuff ok?! I only allow cuddles! But if you two need.. gives Muichiro a condom that's if you need this! Shinobu giggles

Muichiro: uhhh...thanks?..