The text in all three untranslated bubbles (with the third being interrupted) is a Russian marriage proposal with the words written in katakana:

ヤーハチュフスユ ジィーズニプラヴィス ティスタボーイ
yaahachufusuyu ji-iizunipuravu-isu tisutabooi

Searching on Google for Russian marriage proposals brings up phrases like "Я хочу быть с тобой," which seems close but isn't exactly the same.

If there are any translators proficient in both languages willing to help, I would like this translated into Russian text, as its meaning is already explained in the comic. If the Russian is bad or means something different, an explanation can be added in a translation note in the first bubble.

I think it's "Я хочу всю жизнь провести с тобой".

mock said in comment #2585807:

I think it's "Я хочу всю жизнь провести с тобой".

That should do it. I listened to the pronunciation on Google a few times and it seems to check out. And https://en.openrussian.org made it easy to check the definition of each word to make sure the meaning was close enough. They are a little different, so I added it as a tn note to Laura's speech bubble in the fourth panel instead of the first panel so as not to ruin the impact. Hopefully, I interpreted it correctly.

Thanks a lot for the help!