Yeah I think the Doctor kissed Biff and then punched him for the accidental gay kiss… Or, or… Just hear me out. They both became turned on by their accidental kiss and the two of them 69ed one another and then Biff pulled Doctor Caballeron out of his mouth so the good Doctor could cum on his face, but some of the spunk shot right into his eye. And as Lenny from the Simpsons would say. “Ow my eye. I’m not supposed to get cum in it.
Nah I think he just ended up getting a black eye and he wants to keep it covered.