Jinno stares at Eichi the whole time and Eichi, annoyed by this situation decided to confront him, giving as a consequence both of them having sex at the bathroom of the bar they were at. Eichi starts to ask himself if this is because he was an easy target or because Jinno likes him.
I liked this a lot! They arguing about who got hard first, demanding to be called by a pet-name, blushing and letting a ton of fireworks lit up. It's really lovely.
Torokeru Kami-kon