Might get deleted because of being off-topic but oh well...
Similar games or ToT clones which some have more potential than ToT would be:
"Domina" (contains some extreme content that i do not like),
"Katalist" (unique art style that some people do not like also latest versions have been quite buggy and delayed but trust me no one can take the throne of delays from Koda),
"Gladia" (immense potential IMO),
"A New Life in Submission" (I personally look forward to this one the most),
"Kingdom of Lumeria" (new, cool dev who has done some spin-off ToT games before)
others I can remember are "Project Supremacy", "Outclassed Pervert", "Infinity Realm", "MsQ 3D Remake", "Escape from Misantria", "Eyes Never Lie", "The Prison 2 - Never Ending" and "Isolated with Mom" all in rpg maker or have similar gameplay...