[Hiccup pauses in his setting up, taking hold of one of Jack's arms from where he's squatting to do it.]

Jack, you know I'd never intentionally do that. I didn't know. I just...wanted to carry you to my room like I used to...

[Like I used to carry you to our den. It goes unsaid but it hangs in the air as Hiccup stands, reaching with his free hand to cup and caress Jack's cheek.]