Mahou no Rouge Lipstick
Japanese title: 魔法のルージュ　りっぷ☆すてぃっく
Type: OVA
Source: Original
Episodes: 1
Status: Finished Airing
Aired: Jul 10, 1985
Duration: 23 min
Rating: Rx - Hentai
Producers: Byakuya Shobo
Genres: Hentai

A young gradeschool girl can only envy her already teenaged friend's boyfriend. But when she meets a magical salesman pig and receives a magical lipstick (containing another magical sidekick creature, if that's not enough magic for you), it's time to magically gain some years and hit on the boy! But what if the spell breaks and he realises he's been getting hot and heavy with a nasty-minded but still preteen girl? 

(Source: AniDB)