Is sans the skeleton breedable? Well, the question is not as simple as you’d think. You see, monster biology is difficult. We know some monsters can get pregnant, as how toriel and asgore bred. However we don’t know if monsters are one race as a whole, or are in the same breeding group, let me explain. A breeding group is when animals who are biologically similar can breed due to their similarities, like how horses and donkeys can mix. We don’t know if the monsters from Undertale fit that category. They may be able to form relationships (like alphys and undyne) but conceive a child, might not be possible. So what do we do in this situation? We look at what we know, you see, after a monster dies it turns into ashes meaning that they all must share one biological similarity for that to occur. I believe that to be magic, something all monsters share (to varying degree). This similarity could be the thing we’re looking for so let’s examine it. So, each mister has its own unique magic, that is engraved in it’s soul. But why only monsters? Well, I believe they all derive from a common ancestor, and by millions of years of evolutions, you get different sub-species. Which would mean that they are, in fact, categorised in the same species, but they’re all just sub species. Like how zebras and horses are similar and yet different. This would mean that inter monster breeding should theoretically be possible. But why did I spend so much time on this? Well it’s because we would have to first confirm they could breed with each other, to find out if they could breed with us humans. Now here comes the trickery bit, humans do not share magic. Instead they have determination, by comparing magic and determination, they act very much alike. however, are still different . Determination allows humans to reset (in the case of frisk) There for, bending reality, so it can be seen as magic on steroids. So there is some connection, like a distant cousin, but this does not mean humans could breed with monsters. From what it looks like, most monsters have a similar biology as us with drastic differences but they are all humanoid (for the most part) The only other species in the world that are remotely like us are apes. However, we cannot procreate with them. So it’s a lose cause right? Wrong. You see we have the bonus of having similar biology and similar magics this coupled with the fact that the monsters are more humanoid than apes, I believe some monsters can reproduce with humans. But can sans? Well, sans the skeleton seems to be that of a human or humanoid creature, which while we don’t know much about the brothers past, I believe them to be born skeletons. Here is we’re it gets tricky. You see, there is a running theory that w. d. gastor is related to the boys, My leading theory was that they were created in a lab by gastor himself! So, I don’t think they were turned into skeletons, I believe they were made in design of skeletons, specifically, humans. We know it’s possible, since gastor must’ve come into contact with humans before, given the war between the monsters and the humans. Now that we know that the boys are modelled after humans, and that some monsters can procreate with humans. Let’s get to the meat and bones, Can sans be breed? Well, you might think not. However, in his boss fight after you beat him, he does bleed, which means there must be some sort of biology beneath his clothes. Also the fact he wears clothes at all indicates to biology, since if he didn’t have genitals, he and papyrus could just walk around naked like many of the other monster species do. So, there must be hidden biology beneath that hoody, everything points to it. Even the fact that they eat and can taste food show that they have biology. With the facts we know they must have reproductive organs. Now is sans actually breedable? Well, due to the fact His skeletal shape is similar to ours, the internal organs must also be similar or else they themselves would look drastically different. So, they have human skeletons, human insides, and human reproductive origins. So yes, sans IS breedable. You can have sex with sans Undertale!!!!