Some good artists I can think off hand are NaPaTa, Distance, Homunculus, Ozaken, Miyahara Ayumu, Fukuyama Naoto, Fuuga, Taropun, LUNCH. The art is good, story telling is good, and majority vinalla/happy-sex. There will be some potentional forced and incest mixed in, but honestly it's not that bad.
Some stories I can reccomend that weren't included within the above mentioned artists are Girlfriend-Friend, Velvet Kiss, and Two Siblings’ Fela Pure (yes this is an incest story, but the art and sex scenes are very well done.... honestly I just ignore the fact that they are siblings in most cases, but to each their own).
The Lusty Lady Project is a Scanlator group that usually translates very vinalla works so you could check under their name.
Other then that you will just have to do a search for yourself for any more material. Stick to tags on here such as vinalla (exlucde NTR and incest). Some other sites use the term "happy sex".
This site is pretty good, but another good site to use for tame works is: http://doujinland.com/gallery/