Ya know, I'm not surprised that Sans isn't in the house. Right before Alphys visited, Papyrus was going to ask for a favor from Sans which we never got to hear. Then after the visit Papyrus asks for a favor and then asks Sans to leave, so he's probably thinking that's the favor from earlier, and considering how they were just talking before Alphys came over, it's no wonder he would probably take it the wrong way. No idea where he is though, lol. (I LOVE YOUR COMICS BTW!!!)
Yep, that’s what happened. I’m not suprised either.
I wonder if Sans sometimes has the need to rest from helping his brother in every way, and if maybe he was relieved to actually have an excuse to leave his side…
Thank you! ^^