Is there an event that forced futafication when defeated?

[kain]

not consume item myself
only forced futa TF

 

[KnightOwl]

The closest thing I can recall to a forced futa TF in CoC is if the PC is a female that loses to the Anemone and is impregnated as a result. The first Anemone pregnancy always ends up giving the female PC an Anemone penis (the second gives birth to the Anemone Kid NPC).

 

[Map1804]

I dont remember if izma the tiger shark is from the revamp mod but if you continue to lose to her 3 or 4 times she turns you into a forced shemale tiger shark, this is a game ending script however.
(she is found in the lake) she has an extremely rare spawn rate though.