In the most recent arc, Abby injected herself with succubus blood from Chloe in order to get larger breasts. Instead, she merely acquires wings, horns and a tail. Through a series of events, when Chloe tries to turn Abby back to normal in exchange for Chloe's boobs, Abby instead signs a contract that allows her to become a full succubus and goes through breast expansion, butt expansion, beautification, and age progression.
Abby injecting blood, imagining BE:
http://www.dangerouslychloe.com/stri...-still-boiling
Small Chloe BE:
http://www.dangerouslychloe.com/strips-dc/tears-of-pain
Abby imagining breast transfer:
http://www.dangerouslychloe.com/stri...-always-wanted
Abby Transformation:
http://www.dangerouslychloe.com/stri...-this-contract (pre)
http://www.dangerouslychloe.com/strips-dc/booger