The ending illustration in episode 1 suggests a girl-girl relationship, however both participants are fully clothed.

The ending illustration in episode 3 is perhaps the most suggestive as the girls are shown with their shirts open with only Wooser blocking their breasts.

Most of this show is suitable for all ages; however, the ending illustrations in episodes 1 & 3 seen in the last five seconds are mildly sexually suggestive, and as such you should stop those episodes before the credits end if watching with young children.