Xbooru - 1boy 2d 2d (artwork) animated skeleton artist name blue blush blue cum blue eyes blue penis blue tongue blush covering one eye cum cum on self digital media (artwork) dinogirl69 ectopenis fangs genitals glowing glowing genitalia glowing penis grabbing own penis lying down lying on back lying on bed male male masturbation male only masturbation monster naked male nude nude male penile masturbation penis sans sans (undertale) skeleton solo solo male third-party source undead undertale undertale (series) video game character video games visible breath