This is most of the Swedish Erotica loop #187, entitled Delivery Boy, with Holly and Paul Thomas. As usual, it was reprinted and anthologized in several different places—e.g. in #3 of their 1-hour series (the one with Rhonda Jo on the cover), and in #2 of their 4-hour series (with Christy C on the cover).
The full loop has an establishing introduction, but this post has all the meat of the loop, so to speak...