Thanks for sharing your thoughts and experiences with us. You are a beautiful person and a very good Mommy. You have a wonderful relationship with your friend, Barb. I hope she knows how much you appreciate her. Perhaps you will send her a card or flowers or take her out to dinner. She brings out the best in you. She seems to know just what you need and it is good that you listen to her and follow her instructions. You probably want to spend more time with her and explore a deeper trust relationship. You can let us know what else you learn from her as she guides you. She seems to be an expert and knows just what she is doing and you seem so fulfilled in your experiences. You are more confident in yourself when she is coaching you. Everyone needs a special trustworthy friend like that. We all can learn a lot from you two. So thanks for sharing.
It is so interesting that after you let her take control, you were ready to be in control with a strong desire to make your boyfriend be a baby for the weekend. Sounds like you both had a wonderful time together.
Did he respond well to all your commands? How did he do in baby-mode? Did he really get into it? Besides wearing diapers and eating baby food in a high chair, what else did you have him do? Did you make him use baby-talk, toddler walk, play with toys, suck his thumb or pacifier, drink a bottle, nurse from you before naptime, watch Barney or other kiddie shows? What baby clothes does he have?
If you are looking for ideas to help him get into 'baby-space' so he regresses and has a more authentic experience, you might make a list of baby behaviours for him to learn and then spend the weekend practicing those using a system of punishment and rewards. For rewards you can give him a sticker when he gets the behaviour right consistently. And when he earns so many stickers you can give him something he really wants or enjoys so he will be highly motivated to get it right. If he continues to resist or mess up that's when punishments come in (spanking, time outs, take away stickers earned, withhold things he wants and enjoys, threaten to tell someone you both know that he wears diapers-the threat of embarrassment can be a good deterrent for some).
And once he has those behaviours down, then you can invite Aunt Barb over to watch him perform. Then you will be so proud of him and enjoy that special feeling of success and fulfilment with your friend affirming your accomplishments.
Some baby behaviours you might consider are: colouring (using only his weak hand or wearing mittens), read you a baby book, performing a nursery rhyme (Little Bunny FooFoo), doing the desperate peepee potty dance when he has to go bad, toddler talk/walk, casual thumb sucking, playing with a stuffed toy as a special friend, etc. I'm sure you can think of plenty more that you might like to have him try.
The idea is to make the experience as authentic as possible for you both. One way to start would be to diaper and dress him and then feed him a bottle or two with his head on your lap on the couch. (If you need him to relax and let down, give him a few beers before you start). Have him close his eyes while you talk softly in his ear and regress him back to baby land. Make sure you use Mommy talk all the time. Tell him all things you want him to do in baby land. Then tell him about the rewards and punishments. Then go over each behaviour again and ask him if he's going to be a good baby and do those things. Get him to say 'yes' to each behaviour to seal your deal. Once he agrees you can confidently enforce your rules. You can even use key words to trigger certain behaviours if you want. (For example, when you say the word 'No' loud and emphatically, he should respond by crying for a minute for being scolded and not getting his way.) Try it, it will be fun. Then let us know how it goes.
If he needs help with certain behaviours, you can look them up on YouTube and get him to watch those until he memorizes every move. You can find good clips of the peepee potty dance, performing nursery rhymes, casual thumb sucking, crying, and other childish behaviours on YouTube. Again the point is to create an authentic experience for you both.
Remember practice makes perfect. Have fun.