I've had this experience, and it was wonderful. My large and lovely vanilla ex-girlfriend from my first round of graduate schooling had very little diapering experience, yet fortunately she had changed cloth diapers with pins and had used rubber pants. I bought some Gerber birdseye flatfolds and asked her to pin me in them. She did, and then she changed me when I was desirous of that (diaper was dry). We enjoyed ourselves, but she seemed dissatisfied.
I wrongly assumed her resistance stemmed from the usual querulous vanilla reservations about ab/dl behavior. Uh-uh. Turned out she wanted to be diapered! This was enjoyable too. But still she felt dissatisfied.
Finally she told me she felt the diapers were distancing us from each other. She longed for intimacy in diapers -- simultaneous wearing, so we both could be happy. So we pinned ourselves into our two flatfolds (pinned together end-to-end; these were not adult diapers) and made love for hours. Satisfaction at last! Multiple mutual orgasms and face-to-face intimacy with kissing and snuggling and all kinds of loving fun. (Number-three messes only.)
Eventually we used adult-sized prefolds (couldn't find flatfolds at the time), and added the largest pair of Netti SuperSoft PUL pants available. Plenty of room for diapers and two pairs of legs and bottoms and everything else. One happy diapered couple!
I have had other vanilla girlfriends change me as an ab and as a dl, and that has been enjoyable as well, both for me and for them. My last girlfriend (who I met after my second round of graduate school) regularly would change me and satisfy me during lovemaking as a reward for my helping her to squirt copiously and to have multiple orgasms for hours on end with no diapers in sight. I really loved pleasing her, in all ways, and she enjoyed pleasing me too. She particularly enjoyed riding me while I was lying on my back with a dry, opened disposable diaper beneath me during diaper-change. She liked the baby-powder and baby-oil smells and loved the look of the adult Pampers under my bottom. She also enjoyed kneeling or sitting beside me on the bed and giving me a good diaper-change with some lovely touching and very happy endings. I remain grateful to her, as I do to all of my vanilla ex-girlfriends who have embraced my diaper-fetish and my ab/dl being with good-humored, kindly caring and with loving, nurturing erotic affection.