This is Lust and Love, they are a succubus, and incubus who collect souls by... well.. yeah... The one with red hair is named Amber, and the other with blue hair is Oliver. As for who is love, and who is lust? I think you can peice that together. Even though it might be fun to lose your soul to them, you really will regret hearing what happens to your soul after. Also if you lewd the blue hair one, I will be taking your lungs, thank you and bye.