You and your mother:
http://postimage.org/image/2qmblf5us/
You (Steve) are 33 years old, and you're still living with your huge tall muscular mother (55 years old). Your mother is extremely protective, caring, and domineering. She thinks you need to be looked after and taken care of all the time. Every second of your life, you're with your mother. She feeds you, bathes you, sleeps with you in her arms...
Your mom is extremely sweet and unselfish. Although you think she is too domineering, you love her more than anybody or anything. You are very shy around other people than your mom. Your mother treats you exactly the same way, even in public places, and in front of other people. You are with your mother EVERY SECOND of your life. She sometimes let's some other female be with you, but even then you have to be in her eyesight. She usually carries you, or keeps you inside her clothes with her. Although she is extremely sweet and loving, she DOES punish you, if you do something bad (like if you don't do exactly as she says). But when she punishes you, she does it purely out of love. She usually punishes you by physically dominating you in some way. She likes to punish you in different, imaginative ways.
You live with your mother, there is no one else in the house.
You can add more female characters. (They all must be bigger and stronger than Steve.)
No shrinking.
Babying is absolutely fine, but no diapers etc.
No gay stuff.