So a loner kid meets an older girl, and then pays to spend time with her. If memory serves there was no Ecchi… other then that the two things that stand out in memory are that the amount of money was some small amount of yen, something like 300-500 or so, and that the last chapter has the now grown up boy meeting the girl again. Read it around the same time as ‘My Fair Neighbor’, and I’m looking for something that will not let me forever about it to put it to rest.
And to also put it onto a short list to be able to read it later.
Thanks in advance if anyone knows which series it is. 🙂

Maybe By Spring? It has some explicit content though and I can't call protagonist a "kid" exactly, but he's younger then the girl.

That’s it! Thanks!