I love watching these things with you.

These girls love mutually watching nuclear detonations. "I don't know which is more adorable, you or the nuclear detonation." You are looking to learn. I want to encourage this. I do not want to discourage this," has your heart in it. The rhythm—statement, support, reinforcement—feels like a verbal pat on the back. The comma’s a minor slip (like a misplaced rune), but fixing it to a period seals the spell. "Do not" adds your deliberate flair, and the repetition of "this" mirrors your word-spending to"