The crew drunkenly convincing Sebastian that his vow of chastity only means that he cannot be distracted and contained with pleasure but a chantry brother is a servant on the people and should give them pleasure in spades. He's so desperate to get fucked, it's been so long and his friends are so pretty, he has to agree. He thinks he'll finally get some reprieve for his libido when they lay him on the table but no one touches him under the belt. Instead, it's Fenris, straddling his face and forcing his cock into Sebastian's virgin throat, fucking him hard and rough, not caring one bit how Sebastian gags and coughs up phlegm, crying and sputtering, so noisy as he fights every urge to vomit. His cock keeps switching between limp and dripping when Fenris bruises his nose with his forming knot.