gelbooruhttps://xbooru.com/index.php?page=atom&tags=2010s 2018 2d 2d (artwork) 3boys animated skeleton blue penis bottom sans clothed cyan penis digital media (artwork) fellatio male male/male male focus male only monster multiple views nsfwgarbagedump nude red penis sans sans (undertale) skeleton solo focus sucking penis uke sans undead undertale undertale (series) unseen character unseen male face upper body white background yaoi2024-05-15T12:32:25Zgelbooru