Other than sourcing some juicy erotica, it's important to consider what type of story you're looking for. Scientific, magical or mystical transformations? Forced feminization? True tales of sissification? Mind control? Your options are truly limitless. As a budding selection of favorites from a variety of genres:
The Setup by Superfry
A guy is troubled by his lost ex as she returns after dumping him and tries to make him suck cock. Features blackmail, semi-forced feminization, crossdressing and manipulation.
Nymphomania by Edward Miller (and the sequel Help!)
A freshman college students is experimented on, becoming going from normal guy to hyper-aroused slut; her body proportions and arousal grow as she reacts to cum. "Scientific transformation, lots of sex, mind manipulation.
Bike Shed Rendezvous by Tomsparty
A 2nd person tale of how you're lured to the school bike shed and tricked by one of the popular girls. Crossdressing, manipulation, co-erced sexual acts.
The Sadler School Sissy by Slave 23
A new addition to a school finds out he's forced to take on a role to 'relieve' all of the other jocks in school. Transformation, forced feminization, co-erced/forced sexual acts.
Remember: There's no punishment for printing one out so you can lounge out by the sea reading your sissy erotica!