I'm thinking Rangiku from Bleach or Saeko from Highschool of the Dead

Ikaros from Heavens lost property
That pose has been done too many times try one of these
sex poses
External
External

Well I think both #Sylernice7 & #Moldrad choices of girls are very good choices but let me give them my punches of girl choices and they are
Akeno Himejima from Highschool DxD and
Albedo from Overlord
to show my set of s****s

Those two are so good choices Dsabastin Akeno and Albedo are both sexy

I guess should've added that it's Natsu x Female Character

Lol Now you say the male characters name ok here's my choice then but I don't know that did you already decide or not with the female characters but still I will say my two choices are :-
Mirajane Strauss
&
Cana Alberona

Maybe Cana