Ore ga Saimin Appli de Mesu ni Naru Wake Nai daro! and Gakuen Saimin Reido are the first that come to mind.
There are so many that it's hard to pin one down, but I find myself going back to those two every now and again. The first one is a doujin where the MC uses an App to hypnotize his brother into being his girlfriend. The second one is a game/anime that focuses mostly on a fat bastard with other girls, but one of the heroines is a school bully (male) hypnotized into becoming his former victim's woman. I highly recommend looking up scenes with "Shouko" on Nico Nico or something because those scenes (especially the first one) are peak forced fem. The scene where he/she fights back against the hypnosis after looking down and seeing his new boobs/skirt is peak hypno imo. I just wish that he fought back more in later scenes too.
All of Amulai Sweet Factory is hypno stuff, but it varies on how "forced" it is so that circle is pretty hit or miss for me. If you want novels, "Creating Samantha" by JoeSixPack was pretty good I thought. There's a great scene where he tries to break free towards the end. For me, hypno needs to at least peddle the illusion that the main character can fight back, or there needs to be some sliver of his personality left before it's finally snuffed out. Instant-girl hypno just doesn't do anything for me.
Oh also, there was a naruto/naruko hypno doujin posted on e-hentai recently. I thought it was solid enough