Your sibling is your sibling. If you want to get your sibling a birthday present (or something for Christmas, Rosh Hashanah, Eid, Summer Solstice, July 4th, whatever), then get them a present. Wrap it however you want. The present comes from YOU and the wrapping comes from YOU. All of it should represent who YOU are as a person and the love you have and want to express for your sibling.
Wrap it in comics if you're a comic fan. Wrap it in tissue. Wrap it in brown grocery bags that you have re-decorated with markers and crayons. Find your sibling's favorite fantasy character-themed wrapping paper.
Not everything is about sex. But everything should be about love.