Here are a few German translations, depending on the nuance you want to convey: ** Heiße Schwester im Urlaub: *(Fairly literal translation; could be interpreted as "attractive sister" or a sister who is experiencing hot weather).* *Attraktive Schwester im Urlaub:* (Focuses more on the attractiveness of the sister). ** Sexy Schwester im Urlaub: *(More direct and potentially suggestive).*