More than 20 years of reading manga, this is probably the first title about highschool romance that actually showcase proper supportive relationship by also showing the dynamic of their immediate families and how everyone involved grow their characters, not just the mains.
This is fire!
I'm glad that after everyone is used to the whole Rentarou introduces new girl kinda thing, the author decided to spice things up by having new gf infiltrated the family instead.
Could have never seen this coming.
Ain't she a gravure/swimsuit model of some sort? I think what she meant by protecting the v-card is to resist all kinds of temptation in the showbiz world that would make her lose the v-card.