When Kris asks for a favour, it seems simple enough: take their old television and keep it at your place, since it means a lot to them and they don't want Toriel to throw it out. You accept, but then they explain the television is actually a man named Tenna, and -- socially awkward as you are -- you plug him in and try to strike up a conversation. Surprisingly, it works out, and you gain a new friend (and maybe a lover eventually, if you keep up your smooth moves).