I think Yoh's actions in this chapter are mostly understandable. Yeah, objectively speaking she should just tell Misa what happened. But she's a teenager and she doesn't want to break the heart of the girl she's in love with, so I can see why she went along with Ren's blackmail instead. Going on the date at the end of the chapter is much less understandable, but maybe the next chapter will explain that further.
(Also let's not forget that Yoh sexually assaulted Misa in chapter 1, her hands aren't exactly clean here.)
I get why most people on this site don't like this manga but I'm still interested in it, so I'm looking forward to the next chapter whenever the scanlators want to see it get trashed again lol.