Yes, Toriel Sans is very much in love with you. He’s pretty sure you want nothing to do with him romantically however, so he hasn’t said anything.

The reason he hasn’t asked you out yet and or confessed to you is because he thinks your gonna like SUPER reject him.

We are certain, Toriel, and I for one would not lie about such things. If for no other reason than it would be needlessly cruel to poor Sans. Who, by the way, is convinced you’d say no if he ever asked. Which is why you had to hear about this from us. Sans. Consider this a donation of bravery.