(i) guy you hang out with
(ii) man-on-man action
Between those choices, I'm going with (i). And as a guy, the H!P prospect that I'd hang with would be Okai Chisato.
|From Okai-chan Neru|
To me, I always thought of Chissa as being the most tomboyish of the Kids. I remember her as being very impish, pulling pranks on the others.
And some time between then, she started blossoming into a lovely young lady. I believe she started coming into the scene some time after her 2nd solo event.
Then she went and developed a web presence, hosting Okai-chan Neru and the fairly successful Odotte Mita.
One of the Okai-chan Neru was in the heat of the World Cup, and Chissa was professing her support for the Japanese team. I have quite a lot of respect for the Japan team, scoring goals from free kicks while being surrounded by enormous Europeans.
So yeah, Chissa. We'd play a bit of footie, then chill by playing videogames while having crisps. Sounds good to me. Man-on-man action might ensue, but that'll be quite a development into the future
The common answers seem to be Maimi or Yossie, and I'd probably have gone for the latter had I taken interpretation (ii) of BF. Stems from having read Shining Musume.