This is a futanari manga called P Total Bio-chemical Laboratory by RaTe. Its in English and is a good 180 pages long and actually has a good story. No adware or trojans or anything of the type. Just use winrar to unrar it.
And remember, seeding is as easy as doing absolutely nothing after downloading and would be very much appreciated (when thought about like that, makes you think why no one seeds..)
Side note, I have a slow connection, roughly 20-30 kBs uploading, so i'll leave this up for about a week or two