Yuyuko could barely hide her smile.  It was one thing to admire her sister's body from afar, but something else entirely to be able to touch her, even if it was as simple as putting some lotion on her.  Settling down a little, trying to not sound too excited, she knelt down next to Kat and took the lotion.  "Sure, if you don't mind doing the same for me," she said.<br/><br/>She squirted a little lotion on her hands, rubbed them together quickly to dispel any chill from the lotion, then started to massage it onto Kat's back.  She tried to not make it overly sensual, but couldn't help herself from taking her time, kneading Kat's shoulders and back a little as she spread the lotion around.  When she couldn't stall any longer without making it too weird, she stopped, then stood up and pulled over her own chair and laid down on it.  "Alright, your turn, Kat."