Oretachi wa Shinkon-san Kamo Shirenai

"Is a love that starts with marriage possible??"Nasukawa, a science doctorate student bent on rational thinking, and Kaburagi, an elite employee, are friends from back in university. They started living together because they both had money troubles, but their landlord said he doesn't accept male-only house sharing, so they got married as a camouflage. Since their married life started, Nasukawa realizes that his heart beats faster for Kaburagi who was only a friend to him till now.That's when Nasukawa's bed breaks down, and just as they were about to sleep together in Kaburagi's bed, the later initiated some overly mature physical interactions. Just as Nasukawa is trying to calm down his body reactions, Kaburagi offers to do "mutual masturbation"!?