Guinea Pig 2 (Pixiv Fanbox)

Some of Professor Zweistein's experiments would have real potential. Unfortunately, the results are often too extreme, as the professor can never hold back on the dosage. Here, our adorable schoolgirl Julia sees her dreams of bigger breasts fulfilled by Professor Zweistein beyond all measure. Whether bras in this size are sold at all? But the professor is more than satisfied with the result.