There are pose sets - often several from several vendors - for most kinds of sexual activity and positions, but the one I don't see but would like to buy (Genesis 8, preferably) is a good titfuck set. Thought there'd be one from IWitch to go with the Titjob morphs for the breasts, but sadly not.
Scope for a number of positions: male lying on bed, female kneeling on floor; male flat on bed or floor, female kneeling on same surface leaning over; male standing, female kneeling or sitting in chair or on edge of bed; male sitting on chair or bed, female kneeling between his legs; and of course, female lying on bed or floor, male kneeling astride her, both him holding her breasts round dick and her holding her breasts round dick, plus maybe her tilting head forward to lick or suck the glans each time it emerges, plus him shifting back and up to jerk off on the tits, etc.
(Actually, while there are many products for generating various large breasts, there's an overall lack of interacting with breasts in the assorted pose sets, fondling, grabbing, licking, kissing, nibbling etc while in some of the positions where either he can reach her breasts easily, or she may play with her own.)
I have dollars waiting for any vendor putting a good set (or even reasonable set).in the store ...