I don't do bottles, but the feeling of just letting go in your diaper is amazing. When I'm age playing with my girlfriend, we often make a big deal out of our wetting "accidents," as part of our play. We'll jump around holding on and leg crossing while announcing how badly we need to go, until one of us has the inevitable accident. It's great, and we love doing it.
But I love the quiet relaxing pee in a diaper without a big deal being made. We often put some blankets on the couch to protect it, then wear diapers underneath our footed onesies while we watch a movie. During these times we both just quietly use our diapers as we sit there, and don't talk about it much. I admit to "having a thing" about being told to go in my nappy, I just love being given permission, so the following conversation usually takes place.
"I need to go and do a wee"
"Just use your nappy. That's what it's for"
"I don't think I should"
"Why not? I've wet mine a bit already! Look/feel this"
After that I'll just sit back and slowly and quietly pee a bit at a time, squirt by squirt as I watch TV. Maybe after a while one of us will ask the other if we've "gone" yet, but it's all in the spirit of being little.
Even when I'm alone I love having a slow gradual pee in my nappy while watching TV. It really brings the little out of me!