Koisuru Boukun

Both are - obviously - Yaoi and both contains ( more or less heavy ) Rape scenes. ( Thought I have to admit that Koi Suru Boukun is more.. hardcore. ^^ ) 

1. KSB is a mixture of J.E. and J.R. but mostly J.E. (J.E. because of the Senpai-Kohai relationship and the similarities between seme and uke; J.R. because of the fact that both uke used to be straight and there is a great involvement of the family element.) 2. The stories are well-done, not forced, and funny. 

Both have similar relationship where one is the hot headed type, and the other the calm kind one. both funny, and highly enjoyable. You'll love 'Koisuru Boukun' if you liked 'Tight-rope'. ENJOY :D 

Honestly...it is like the same show. It's like it is just one couple more in the Sekaiichi world. One more story. It's even the same animation style :) 

both have student-teacher relationship both BL both incredibly perfect <3 

Both anime could not be more similar. There is a senpai-kouhai relationship. Senpain is the uke and Kouhai is the seme. Kouhai has been madly in love with his senpai but senpai really does not care that much at the beginning. Kouhai at some point kind of forces himself on his senpai. I think these anime are the perfect match.  

Both are about a homosexual man who rapes another male and gets away with it. Only difference is that in BNP, the other male is underage, and it is more explicit. 

I think that Yuri on ICE and Koisuru Boukun is very similar as they are both in the yaoi genre and both have a growing romance between the two leading males in both animes. Both animes brought me to tears! ( but im just an emotional guy :P) and even though Koisuru Boukun is a much shorter anime than yuri on ICE, it still has a similar story depth when it comes to the romance portion. So go give it a try <3 

Yaoi; both have guys who don't know they're gay, then find out they are.  

MM! and Koi Suru Boukun? They a aggressive tsundere (Mio Isurugi and Souichi Tatsumi) and Funny Masochist (Taro Sado and Tetsuhiro Morinaga) So this really depends on ever. MM! is Hetero and Koi Suru Boukun is BL Both are humorous comedy. 

As for me, Souichi and Soubi resemble each other + we have boy-and-boy love in both cases. However, Koi Suru Boukun is a more "adult" variant. 

Both about long term relationships. 

Yaoi/shonen ai which has tsundere uke, somehow there is a child girl there, and there is a blackmail somehow too and a persistent seme somehow too, again. One is a movie and the other ovas but the duration is practically the same. And of course Koisuru Boukun is more explicit. 

Both are pretty humorous I must say, and both have one of the guys not only older than the other but also have a relative they cared a LOT about, and try to do their best in protecting their well being. The main difference is in Koi Suru it's a little bro when in Kirepapa it's a son. 

Two episodes of attractive bishounen with a roundhouse kick of smut between them. What else is there to ask for? 

Both anime are BL and both have a character that doesn't accept the fact that he is in love with a boy.