Everyone keeps saying TG.. but it;s more along the lines of TLG.The Guardian
It has a massive relationship with a lot of girls and hundreds of scenes.
But the story is quite a mess, you will stop caring for it after a couple of hours with some exceptions since it flip flops around different subjects.
Since Lilith is MC's sister (Since Seath has made it very clear that Marge was lying her ass off for her own gain when she told MC that BS about Lilith being MC's daughter), they actually had Once offspring together, and she is an LI in TLG (along with most all the other daughters and nieces from TG have daughers in TLG to be LI's too).