Well but honest question: Why is he expecting robin to go through this pain again instead of taking it himself? I mean it was very obv from the start that robin would be bottom but doesn't make sense to me since they r both bf pleasers. If robin says no, hangyul would never dare to try it again. Same goes for robin. He not doing this cuz he enjoys the position. 
Hey please talk to me cuz I got no friends who like this stuff. Also if u like toxic stuff, dun talk to me. Currently loving: The Sleeping Monster Forest.