There's no fanmade h scene voice patches although that would be kind of amazing
the unvoiced h scenes themselves are added to the voiced (all ages) version of the game by a fanmade patch, that's why they're not voiced
e: basically:
original PC FSN/PC FHA: doesn't have any voice acting, does have h scenes
Realta Nua FSN/PSVita FHA: has full voice acting, doesn't have h scenes
Various fan patches (like this one): frankenstein these different versions together