I've become absolutely infatuated with the servo my sim created as a result of not making any new friends in university. My sim is not only a gloomy loner, but a vampire with undead aura, so as a result of not making any friends he decided to be more literal, and proceeded to make a friend. The servo, 4D4M, ended up with the collector aspiration (and the geek trait) and between terms I sent my sim home for the holidays. In an attempt to teach his servo normal, everyday sim things, such as how holidays work, he gifted his treasured, max level limited edition Veild voidcritter card he used in his childhood, and 4D4M's excitement and little happy dance melted my heart, more so than any regular sim ever did with the same interaction. Now it's tradition for my sim to gift his servo random collectibles for Winterfest and other special occasions, and his side of the dorm, and now his own bedroom in their apartment, is decked out in voidcritter merch and has shelves to display his cards, snowglobes etc.
And I seeing 4D4M hover across campus for class in the pouring rain, with the happy moodlet face, holding his polkadot umbrella. Yeah, I didn't even know my voice could reach the pitch that escaped me. Such a precious bot. And the robot dance he does when jamming to S-pop is fantastic.