Don't be stupid!

There is no way you are willing to your finger in her stinkhole! And there is virtually no way she would like that anyway! You tried anal before. Not from your own accord but you did have the bad luck to get fucked in there. It hurts! A lot! Why are you even thinking about this?

Your inward monologuing is interrupted by an orgasm, it's way too intensive! Why didn't you tried this before? Girls are just way more fun! You think and take your fingers back out so you could dive back in with your tongue. Jin reacts to this by locking your head in place with her legs.

And THAT is the moment when the goblin hormones kicks in and you loose control.