
If I bought the chapters that come after this ... how in the hell do I get them on here to share with y'all ? I'm not very tech savvy lol

put them in a google drive or imgur and then click the white flag on the left side of the manga and under 'others' put in the link and the name of the manga if it's a new one,, if it already has published chapters, then just go to that page and put the link in the others part and the chapter number, mangago will do the rest!!
still if you cant see the flag thing then just post the link here on comment section there are many people who will help in posting them

Can someone explain the valentine bonus? Like are we skipping to the future for a moment or...? I'm sorry I know this is a stupid question I'm just confused lol

The whole story of Here U Are is about YuYang telling their story, as how they met each other and all. The Valentines Special is a little forward than that, after they were already together as a couple.
Have you watched "How I met your mother"? Same thing, there is a great advantage in that kind of narrative, you can fast forward and back a lot, because the main point is to connect the dots little by little.
DJun also use some spoilers in the story to keep the viewers' attention and engage them in the story as it flows.
I'm scared we will suffer heartbreak from takosan getting fed up right before we end on a happy note with ritsu saying he loves him. And to be honest I don't blame him for getting impatient. As for nao. I have a feeling he will find someone "whom we probably have already met." To fall in love with. It seems that sensei always gives all of her characters happiness, rather it be junjou, sekaii, or a mixture of both.