Not vidya but when I was visiting my dad as an 11-year-old, he took me to Blockbuster and asked me to pick out a movie for us to rent. I chose this because apparently my slowly awakening sexuality desired tentacle hentai and monstergirls.
Halfway through the movie:
>woman's tongue mutates into a giant alien tentacle that proceeds to fuck her
>"Anon this movie is garbage. What made you want to rent this?"
>Uhhh
>"Okay well I'm going to bed. Clean up after yourself. I will pick the movie next time."
27 years later I'm still jerking it to transformation doujins