page 145a: My cute shou-kun (stupid little brother) is!! doesn't read well. Maybe "How cute m... my (stupid little brother) Shou-kun is!!" instead
page 147a: typo "I took I for my self", it should be "I took it for myself"
page 151a: "yours is getting hard too huhu". She doesn't have a penis, does she? It reads better "You're getting hard..., huhu"
page 156a: Possesives: "This isn't where you say "nee-chan" but your girlfriend's name" (single girlfriend) or "girlfriends' name" (many girlfriends), but not "girlfriends's name"