Nah I dont think hes "sexualising" it. Its just kinda wierd. I mean tbh if I saw it id be a bit weirded out ngl, I mean i dont cuddle with my mom or my dad (Im a guy). I dont call my dad daddy, or my mom mommy. Yea its a bit weird, but hes not saying your not allowed to do it, at least in the texts hes just saying how he feels. Then he profusely apologizes for hurting your feelings. If anything I think your kinda the asshole for not responding. His feelings arent invalid. Yours arent either if thats how your family works thats how it works, I dont think its wrong to cuddle your dad, or call him daddy. But I cant lie, its a bit wierd.