Suprise return (Pixiv Fanbox)

Since Lum's stay at Ataru's house, the boy's family didn't have the chance to be alone in a long time. Ataru and Lum are now away for a Valentine trip and finally the boy's parents can be intimate without the fuss caused by their son and his sexy alien house mate. For this reason, they planned to have a very hot Valentine night together. The woman prepares herself in order to welcome his husband at his return from work. The ring bells, the door is left ajar. «Dear, the door is open. Come in, I'm waiting for you.» says aroused, while lying naked on the futon with a dildo between her legs. A male silhouette enters the room: «Mother, we returnd earlier than expected!», says Ataru, just before looking at his mom on the floor. Based on "Urusei Yatsura" anime show. Line art and colour version included.