They're not masons, they're lovers. Since Reinforce picked them, their alignments are irrelevant to their partnership. They could be two scum, they could be two town or any other combination of factions.
Looking at the player count, we should be in MYLO (Note that the difference between MYLO and LYLO is that town loses after going two town members down in MYLO while losing after going one member down in LYLO). For some reason the day update says we're in LYLO. I assume this is because Celever's got the two mixed up, but there might be some unknown effect in play, so we may want to be a bit careful.
If we're in MYLO, we simply need to kill a scum. It's fine if we in that same process loses one town member, making the dos+Muffin lynch the safest one, because we have two shots at hitting scum, plus the fact that Mr. Muffin has that scummy-sounding ability. However, if they're both town, we auto-lose, without any chance at salvaging the situation, such as with a doctor, vig, or if the scum decide to attack KX again.
If we're in LYLO, we have to kill a scum and only a scum. The dos+Muffin lynch is not viable unless they're both scum, and I'm at the very least town-reading dos. If this is the case, we have to go for someone else. My suggestion then would be TheFlyingPidove.
In either case, I believe Mr. Muffin should claim.