Your comic...

I'll say this first. Your idea for 1.5 is a really enjoyable idea to see! =) I was not expecting this at all, but I am very happy seeing you draw your own idea ^^ You think of great ideas!
I went back to see part 1 again because I wanted to, and seeing 1 and 1.5 together on my computer is like a mini manga chapter. I love how you were able to draw these characters in your own way!
Looking back at part 1 makes me realize just how much fun details are involved in this comic. I like the references in the background, dialogue, and poses! =)
Ok...I'll stop getting sidetracked and focus on the new 1.5 comic.
The first thing I notice is the level of focus this new part has. The tones are easily seen and I love the way the outfits and hairstyles are drawn with these tones you used! ^^
This is newer to me. I haven't seen you draw a sneeze idea like this before. Seeing what causes a sneeze is a personal enjoyment I have because it is a mystery to me seeing what different causes or weaknesses a person could have. Different characters sneeze in different ways, and I honestly love seeing why a sneeze happens =)
I have never induced myself before, and it fascinates me seeing an induced sneeze in cartoons and anime. In real life I've actually had 1 roommate that induced himself with one of those small sticky note squares, using the tips to poke the insides of his nostril rims until he teased the stuck sneeze to come out. We actually talked for a good 30 minutes about sneeze related stuff after I saw him doing this. He does not have any fetishes as far as I know XD but we talked about a lot of different stuff when I lived with that roommate. I have no idea where he lives nowadays sadly.
Seeing the hairstyle being affected with her sneezes in different ways because she tried to be more intimidating with her second sneeze is a great detail you did with your comic!

To be fair, she did improve and had a larger sneeze...it just was not even close to being what she wanted to sound or be like. Honestly that is a good thing! She isn't the one that wants to be true queen. Niijima is the one that wants to be a true queen XD
Speaking of Niijima, the final panel face expression and her hands like that is an expression that needs protecting. She looks really sweet!
I think my favorite part of seeing this comic is the different emotions. I love face expressions, but it is emotions with expressions that make any character stand out more. Hifumi has such determination with her face expressions before her sneezes, and the eyes. I LOVE the differences you did with the Hifumi's eyes! Whether her eyes are strong, pre-sneezy, or closed, I can see the small differences you drew with her eyes =)
Speaking of the pre-sneezy eyes, the overall build up tickling/inducing panels are honestly a lot of fun for me personally. I love seeing the process/progression a sneeze could have with a character. Even if she has adorable sneezes, her sneeze still affects her in different ways. The blushes...aww man. The blushes made me smile a lot when I saw her shy side come out. I wasn't expecting her to get so flustered over her own sneezes like this. It's awesome to see the different levels of blushing Hifumi did in this comic!

You are right Niijima. =) I think Hifumi is adorable too in her own ways ^^