http://www.mangago.me/read-manga/love_knot/tr/64557/page/99/
LOL, are you concerned about bloodborne pathogens?
yes! And this isn't the first manga where someone has done that to a random crush.
(≧∀≦) it's okay, they're pretend people, so hopefully they won't catch hepatitis or worse
http://www.mangago.me/read-manga/love_knot/tr/64557/page/99/