Danbooru-based image board with a specialization in high-quality images.
golden_darkness momo_velia_deviluke nana_asta_deviluke shiawase_kanmiryou to_love_ru yuki_tomoshi yuuki_mikan

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Where is this from? Try Love Ru 2??
It's a doujin called Lo LOVEる -ろらぶる-. Featuring various naughtiness between the four girls here and a random faceless penis ;)