FSDSS-808 The reason why I abandoned my future and personality, became a recluse, and continued to have sex with my childhood friend for three years

I have been handling the sexual needs of my childhood friend who became a hikikomori for three years. Shiyo, a college student busy with job hunting, one day encounters a man masturbating. "...You must think I'm disgusting too, right? If you don't, then suck it." The man takes off his pants. Shiyo, flustered, ends up accepting the request to do it with her mouth.—Can't be helped. After all, I'm the only one who can take in everything about him... Day after day, I continue to accept his sexual desires, and eventually, I too opened my own doors to sex...