Thanks! I also wrote these virgin!Snape fics. I only skimmed your list, so if you have any of them already listed, my apologies.
Six Ways To Sunday, Snape/Nymphadora Tonks, NC-17, warnings: women in charge, fingering, first time, dirty talk, experimenting, (off-screen) torture, legilimentic voyeurism, and h/c.
A Toxic & Tender Time, Snape/Minerva, NC-17, warnings: h/c, dub-con, first-time, rough sex, near-public
The Abundance Of Her Charms, Snape/Luna, NC-17, warnings: UST, voyeurism, wanking, h/c, character death (but NOTE: this is not a tragic fic!)
Falling Into Flight, Snape/Hermione, R, warnings: wanking, 1st time, humilliation, shagging, a drop of h/c, cunnilingus
Last I Saw, Snape/Harry, NC-17, warnings: Harry of age for UK (i.e.-17), dub-con, first time
The One That Got Away, Snape/Neville, NC-17, warnings: Neville of age for UK (i.e. - 17), angst, humiliation, wanking, first time, bottom!Snape, blow job, coming in underpants
My Own Personal Boggart, Snape/Neville, NC-17, warnings: Neville of age for UK (i.e. - 17), graphic discussion/evidence of past torture & non-con (not the main pairing), humiliation, forced exhibition, angst, h/c, wanking, voyeurism, nipple play, oral, hand & blow job, frottage, rimming