Tamaki's cum is slightly warmer than human cum, and much thicker, too. The thickness comes the excess amount of fat that the Femboy's body wouldn't expel normally by other means. So, it's fattier. Any culinary chef will tell you that "fat carries the flavor." When they say this, they mean things like oil, butter, and animal fat. Fattier cuts of meat are usually more flavorful than lean cuts. This applies to Tamaki's cum. Human cum tastes like sea water that is slightly expired, whereas Tamaki's cum tastes like a whole buffet that could force Michelin to re-establish their star rating system. It's like an orgasm for your taste buds. Imagine 69'ing tamaki, and a few seconds after you finish, so does he. This heavenly, thick, delicious syrup fills your mouth and you instantly orgasm throughout your entire body. You're immediately horny again. Thankfully, Femboy body don't really have a refractory period, so he's ready for round two. Then three. Before you know it, you've both came a few gallons in total (mostly his work), and it's a full thirty hours since you stared. You're not even hungry or thirsty, because his cum has enough nutrients to keep you well fed and fully nourished.
Scientifically, since it's warmer, it should be actually thinner than human cum because viscosity decreases with temperature. (Try this out with olive oil in a pan! Heat it up, and it will spread out by itself) However, the presence of the extra fat in the cum keeps it nice and thick. It's extremely satisfying to play with. It's like that cornstarch+water experiment you did in 4th grade. It's somewhat like melted caramel. Furthermore, it coheres to itself pretty well. If you stick a finger in a puddle of Tamaki's cum and drag it from the center to away from the corner, you can observe a large amount sticking to your finger.
