Just tell him: "俺直接老板說,他們並不著急架設那個係統。那東歐小子太狡猾。"
Plus something like: you appreciate his interests in your work, but now you need to focus on your work (and so that you can get something to feed yourself and your baby, does he have any problem with that?).
這東歐人做事的方式有點象四川人說的:“豬尿泡打入,痛倒是不痛,氣漲人!”。